New site, Google dance? sandboxed or site just suck?

I have recently (mid feb) released a new site (my first for that matter) I launched the site with 10 articles of content, from these 10 articles the main keyword from each article got ranked in top google 200 withing a week or so. The highest one got ranked to at no.28

I have continued to add articles (unique), but now with those 10 articles all ranked keywords have dissapeared from google top 1000, except the kw that was ranked 28 (this is now ranked around 160)

So out of 10 ranked keywords only 1 is still ranked in google top1000. All pages is still indexed.

Not much linkbuilding is done at all to the site.

What i cant decide about is what reason this have happened.

• Is it the so called google dance for new pages?
• have the site got penalized or sandboxed?
• does the content just suck and im completly bad at building pages?

The reason why im asking at all is, this is my first site. Im not sure when to let it go and while im still new i want to keep my head focused on few pages. So i dont really wanna start on something new until i get this one working, or not working.


So any ideas what the msot likely reason for this to happen would be appriciated.